print(4/2,5/2)
print('分割线======================')
print(5//2,5//-2,-5//2,-5//-2)#操作数都是int类型，结果为int类型
print(type(5//2),type(5//-2),type(-5//2),type(-5//-2))
print(5//2.0,5//-2.0,-5//2.0,-5//-2.0)#操作数中一个是float类型，结果为float类型
print(type(5//2.0),type(5//-2.0),type(-5//2.0),type(-5//-2.0))